The present computational study comprises the geometrical investigation using the Constructal Design of a triangular array of bluff bodies subjected to incompressible, transient, and forced convective flows in a twodimensional domain. It is considered a Reynolds and Prandtl numbers of ReD = 100 and Pr = 0.71. The body areas and the maximum occupation area of the array are the problem constraints. The problem has three degrees of freedom (DOF): ST/D, SL/D (ratios between transverse and longitudinal pitch over characteristic dimension D, respectively), and H1/L1 (height and length ratio of the upstream body of the arrangement). The objectives are to minimize the drag coefficient (CD) and maximization of heat transfer rate per unit length (q′ ) of the arrangement. Conservation equations of mass, momentum, and energy are solved with the Finite Volume Method (FVM). Results indicated a significant gain in the fluid dynamic and thermal performances of 68.85% and 100.34%, respectively when the best and worst shapes are compared. Moreover, variations of the ratio H1/L1 strongly affected the behavior of CD and q′ as a function of ST/D and SL/D and optimal designs. Thermal streams with complex vortex structures distributed in tree-shaped patterns led to the highest heat transfer rate magnitudes.
Geometrical investigation of bluff bodies array subjected to forced convective flows for different aspect ratios of frontal body / F.B. Teixeira; C. Biserni; P.V. Conde; L.A.O. Rocha; L.A. Isoldi; E.D. dos Santos. - In: INTERNATIONAL JOURNAL OF THERMAL SCIENCES. - ISSN 1290-0729. - STAMPA. - 161:(2021), pp. 106724.1-106724.18. [10.1016/j.ijthermalsci.2020.106724]
Geometrical investigation of bluff bodies array subjected to forced convective flows for different aspect ratios of frontal body
C. Biserni
;
2021
Abstract
The present computational study comprises the geometrical investigation using the Constructal Design of a triangular array of bluff bodies subjected to incompressible, transient, and forced convective flows in a twodimensional domain. It is considered a Reynolds and Prandtl numbers of ReD = 100 and Pr = 0.71. The body areas and the maximum occupation area of the array are the problem constraints. The problem has three degrees of freedom (DOF): ST/D, SL/D (ratios between transverse and longitudinal pitch over characteristic dimension D, respectively), and H1/L1 (height and length ratio of the upstream body of the arrangement). The objectives are to minimize the drag coefficient (CD) and maximization of heat transfer rate per unit length (q′ ) of the arrangement. Conservation equations of mass, momentum, and energy are solved with the Finite Volume Method (FVM). Results indicated a significant gain in the fluid dynamic and thermal performances of 68.85% and 100.34%, respectively when the best and worst shapes are compared. Moreover, variations of the ratio H1/L1 strongly affected the behavior of CD and q′ as a function of ST/D and SL/D and optimal designs. Thermal streams with complex vortex structures distributed in tree-shaped patterns led to the highest heat transfer rate magnitudes.File | Dimensione | Formato | |
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